English Reference
noun

catastrophe

n.
US /kəˈtæstɹəfi/ UK /kɐtˈæstɹəfi/ catas·tro·phe UK spelling catastrophes

  1. 01 B2 Upper Intermediate

    a sudden event that causes great trouble, damage, or suffering.

    a sudden and widespread disaster or misfortune of great significance.

    Simple

    The earthquake was a total catastrophe for the small mountain village.

    In context

    The sudden collapse of the national bank proved to be a financial catastrophe that wiped out the savings of thousands of families.

  2. 02 B2 Upper Intermediate Informal

    a complete failure or a very bad situation.

    a total failure or a situation that has gone completely wrong, often used with slight hyperbole.

    Simple

    The dinner party was a catastrophe because the oven stopped working.

    In context

    The opening night of the play was a catastrophe, as several actors forgot their lines and the scenery fell over.

  3. 03 C2 Proficiency AcademicFormal Theatre

    the final part of a play or story where everything is resolved, often sadly.

    the final event or denouement of a dramatic work, particularly in classical tragedy, which completes the unfolding of the plot.

    Simple

    In the final act, the hero's secret is revealed, leading to the catastrophe.

    In context

    The playwright carefully constructed the rising action to ensure that the eventual catastrophe felt both inevitable and emotionally devastating.

    denouementconclusion
  4. 04 C2 Proficiency Technical Math

    a sudden change where a system moves from one state to another.

    a sudden shift in the behaviour of a system resulting from small changes in its circumstances.

    Simple

    The bridge collapsed because of a mathematical catastrophe in the structure.

    In context

    Catastrophe theory provides a framework for modelling how continuous changes in input parameters can lead to abrupt, discontinuous changes in a system's state.

    Usage

    Often used in the context of 'catastrophe theory'.

This was the kind of catastrophe his parents, both Auschwitz survivors, had always warned him about, when world history and personal history collide.

The Guardian· 15 Aug 2026

If you can help a firefighter to save 15 minutes, it's the difference between a catastrophe and a fire which can be limited to two or three hectares," Chaudier says.

BBC News· 4 Aug 2026

From Ancient Greek καταστροφή (katastrophḗ), from καταστρέφω (katastréphō, “I overturn”), from κατά (katá, “down, against”) + στρέφω (stréphō, “I turn”).

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

This entry
Origin Ancient Greek καταστροφή
Level B2 · Upper Intermediate
Frequency Frequent
Updated